| --- Wed Jul 4 2012 | 00:00 | |
| Sync | gah | 15:24 |
|---|---|---|
| Sync | water condensated on the cooling lines for the HV supply and shorted stuff out | 15:25 |
| azonenberg | :( | 15:32 |
| azonenberg | on a happier note my roommate brought his lathe up and is setting it up now | 15:32 |
| azonenberg | i hope to be machining a spin coater chuck in a few days | 15:32 |
| Sync | idk but the dumb machine dies almost weekly :/ | 15:33 |
| azonenberg | :( | 15:36 |
| Sync | well it is 25 years old but still it should not do that | 15:37 |
| berndj | azonenberg: vaguely like a 4-jaw chuck? | 15:38 |
| azonenberg | berndj: no | 15:38 |
| azonenberg | flat plate with suction | 15:38 |
| Sync | but now I have free access to ln2 and lithography :) | 15:38 |
| azonenberg | the hard part is how to make a spinning chuck | 15:39 |
| azonenberg | with suction | 15:39 |
| azonenberg | my roommate has some ideas | 15:39 |
| azonenberg | Sync: o_O nice | 15:39 |
| berndj | how do you get the suction through the spinning bit | 15:39 |
| Sync | how fast will it go azonenberg? | 15:39 |
| azonenberg | Open question, he has some ideas | 15:39 |
| azonenberg | up to ~4k RPM | 15:39 |
| Sync | oh, that should be pretty easy | 15:39 |
| azonenberg | we'll use a 30k rpm brushless motor and reduce by about 6x with a belt | 15:39 |
| azonenberg | current tentative design is to have a small vacuum reservoir in the chuck | 15:40 |
| azonenberg | and just try to keep leakage rates low enough | 15:40 |
| azonenberg | but we havent tested to measure actual leakage | 15:40 |
| Sync | just bore through and attatch a roating coupler | 15:40 |
| azonenberg | Thats the other possibility | 15:40 |
| Sync | +t | 15:40 |
| Sync | also almost every analytic method you would want for wafers :) | 15:41 |
| azonenberg | :D | 15:41 |
| azonenberg | where is this again? | 15:41 |
| Sync | material science lab here at the uni | 15:41 |
| azonenberg | very nice | 15:42 |
| azonenberg | cleanroom or not? | 15:42 |
| Sync | no | 15:42 |
| Sync | but the litho is in a class 100 | 15:42 |
| azonenberg | :D | 15:42 |
| Sync | but I have nothing to do with them yet | 15:42 |
| azonenberg | can you do film deposition too? | 15:42 |
| Sync | that is what I do | 15:42 |
| Sync | :P | 15:42 |
| azonenberg | Lol | 15:43 |
| Sync | investigating how germanium transistors could be made on si substrates | 15:43 |
| azonenberg | ooh | 15:43 |
| Sync | which is pretty cool | 15:44 |
| Sync | the issue is that the crystal lattice of ge does not fit the one of si | 15:45 |
| Sync | so you get huge mechanical tensions in the ge layer | 15:45 |
| azonenberg | I can imagine | 15:45 |
| Sync | which cause it to crack over about 1ยต | 15:45 |
| azonenberg | Are you doing epitaxy or polycrystalline? | 15:46 |
| Sync | so you sputter a layer of sb | 15:46 |
| Sync | epitaxy | 15:46 |
| azonenberg | But you do it over a non-Si layer? | 15:46 |
| Sync | yes | 15:46 |
| Sync | si - sb - ge | 15:46 |
| azonenberg | So the Si is just a mechanical substrate | 15:46 |
| Sync | yes | 15:46 |
| azonenberg | and isnt electrically active | 15:46 |
| Sync | because it is cheep | 15:46 |
| Sync | well, that is currently investigated | 15:46 |
| Sync | I think somebody here looks into very thin layers of ge on si | 15:47 |
| Sync | like 10nm | 15:47 |
| Sync | also building a n2 liquifier as a side project :) | 15:48 |
| Sync | azonenberg: just try a rotatable pushin fitting | 15:54 |
| Sync | it might not last a lifetime but it'll work | 15:54 |
| --- Thu Jul 5 2012 | 00:00 | |
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